Taprooted annual to perennial. Stems prostrate to ascending, 5–20 cm long, branched with racemes terminal and from upper leaf axils. Leaves all cauline, petiolate, oblanceolate, 2–8 cm long, crenate-dentate to pinnately lobed, the terminal lobe largest. Vestiture of simple hairs. Petals yellow, 0.7–2 mm long. Fruit an ovoid silicle, 2–6 mm long, 1.3–2 mm wide, glabrous; style 0.4–1 mm long; pedicels spreading, 2–5 mm long. Montana has varieties curvipes
(S. Watson) Stuckey (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX)
The following animal species have been reported as pollinators of this plant species or its genus where their geographic ranges overlap: Bombus rufocinctus
(Thorp et al. 1983).